The following perl code trips up font-lock-mode in cperl-mode:
#!/usr/bin/perl
use warnings;
use strict;
use 5.010;
while (<>) {
s{\A\s*<(\w+)>\1Slot</\1>\s*\z}
To reproduce, run 'xemacs -nw -vanilla test-file' and type or paste in
this code, then
M-x cperl-mode RET
M-x font-lock-mode RET
M-x font-lock-fontify-buffer RET
XEmacs prints in the minibuffer:
Fontifying test... aborted.aborted.

I can reproduce with the current released perl-modes package, which is:

...and contains cperl-mode.el version 5.0. But the current perl-modes package
from the experimental packages area (1.14, contains cperl-mode.el 6.2) does
not seem to have this problem, so you may want to give it a try.
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